1·He had a chronic cough.
他患了慢性咳嗽。
2·Objective To study the cause of the chronic cough.
目的：探讨慢性咳嗽的病因。
3·Chronic cough is a common respiratory symptom in children.
慢性咳嗽是儿童呼吸系统常见的症状。
4·Nasal disease was an important risk factor to chronic cough.
鼻部疾病是慢性咳嗽重要的危险因素。
5·Methods:The causes of chronic cough in 60 children were analyzed.
方法：对60例慢性咳嗽患儿的病因进行分析。
6·Objective: To investigate the cause of chronic cough in children.
目的：探讨小儿慢性咳嗽的病因。
7·Research cause chronic cough etiology and treatment the status quo.
目的：研究引发慢性咳嗽病因及诊疗现状。
8·However, pertussis is still a relatively uncommon cause of chronic cough.
然而，百日咳还是相对不常见的慢性咳嗽的原因。
9·Objective To study the etiology of pertinacious chronic cough in children.
目的探讨小儿难治性慢性咳嗽的病因。
10·A chronic cough, defined as lasting more than eight weeks, is not uncommon.
慢性咳嗽定义为咳嗽持续八周以上，在生活中并不少见。